In Too Deep (Rias X Reader)

Y/N L/N, fiancee to Serafall Leviathan and overall powerful being. Rias Gremory, heir to the House of Gremory and in a relationship with the Red Dragon Emperor, Issei Hyoudou. When the two come across each other, morals are brought into question as the two start to connect with each other. How will they react to these new feelings and confront the ones that they love? (I do not own High School DxD or any of the characters.)